fix for GRAILS-6762 "grails-macros.xml references wrong groovy-all jar file"

Author: graemerocher

src/grails/grails-macros.xml

@@ -68,7 +68,7 @@
 
         <classpath>
           <pathelement location="@{cwd}"/>
-          <pathelement location="${grails.home}/lib/groovy-all-1.6.0.jar"/>
+          <pathelement location="${grails.home}/lib/groovy-all-1.7.5.jar"/>
           <pathelement location="${grails.home}/dist/[email protected]@.jar"/>
           <extend-classpath/>
         </classpath>